Door-buffer.



n. F. 0L|VER- DOOR BUFFER.

- APPLICATION FILED JULY 7, 191i.. RENEWED AUG.'18, 1917- 1,262,551, Patented Apr. 9,1918.

2 SHEETS-SHEET, In v WITNESSES Y INVENTOR By W I Y AZ'TOR/IIEVS D. F. OLIVER.

D008 BUFFER. 7

APPLICATION HLED JULY 7, I911. RENEWED AUG. 18,-.1917.

1,262,551 Patented Apr. 9, 19m

2 SHEETS-SHEET 2.

' WIT/VESSFS I l/WEIVTOB ATTORNEYS j DOC'TOR'FBANKLIN OLIVER, or OAKLAND, CALIFORNIA; LILLIE r. OLIVER EXEGUTRIX 0F SAID ED. FRANKLIN OLIVER, DECEASED.

noon-Beam Specificationof Letters Patent.

Fatented Apr. 9, 1918.

Application filed Jul 7,1911, serial 1%. men's. Renewed Angus't in, 1917. serial no. 156,928.

To all whom it conceive:

Be it lniown that I, Doo'ron FRANKLIN ()LIVER, a citizen of the United States, and a resident of Oakland, in the county or Ala m'eda and State of California, have invent ed a new and Improved Door-Buifer, of which the following is a full, clear, and exact description.

The object of the ii'ijven'tion is to provide a new and improved cloo'r bit-Her, arranged not to interrupt the door on the latter *closing easily, but on the door moving shut with more than ordinary force or speed, to interrupt the closing movement of the door and to cushion it withont damage to the door, the bufier door casing and other conneoted parts.

For the purpose mentioned, use is made of a cushioning device and actuating member for the said cushioning device, the said actuating member operating freely without ariec'ting the cushioning device on the door closing with ordinary force, and the said actuating member rendering the cushioning device active on being struck with force on the door closing with more than ordinary force.

A. practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is a perspective View of the door buffer as applied to a door casing;

Fig. 2 is a side elevation of the door bufier in position on the door casing, the latter being shown in section and part of the buffer broken out;

Fig. 3 is a sectional side elevation of the same on the line 3-3 of Fig. 4:;

Fig. 4: is a sectional plan view of the same on the line of Fig. 3;

Fig. 5 is a side elevation of a modified form of the improvement and its position on the door casing, the latter being shown in section; I

Fig. 6 is a sectional side elevation of the same;

Fig. 7 is a face View of the same; and

Fig. 8 is a sectional plan view of the same on the line 8 8 of Fig. 5.

The door buffer is mounted on a suitably constructed support, preferably formed of a plate A, arei'erably attached to the side of the'c'loorcasi1'1g B opposite the one carry ing the hinges for the door, the said plate A being fastened in place by screws C and being provided at the inner face with brackets A, A extending into a recess B formed in the door casing A adjacent to the stop bead B for the door. The plate A is provided with an angular extension A extending on the front face of the stop jbead B and the said plate A and its extension A is provided with an opening A through which projects the free end of a lever D fulc rum'e'd loosely on a tubular c'a'm E engaging a tubular foam F inounte'd to slide up and down on the polygonal portion G on a bolt held on the lower bracket A and having a threa'de'd portion G on which screws a nut G having a bearing in the upper bracket A; The sliding cam F is pressed on "on top by the lower end of a spring H coiled on the bolt G and abutting at its upper end against the under side of the nut G so that when the latter istuined on the threaded portion G the tension oi the spring H can be increased or d minished according to the direction in which the nut G is turned. In order togain convenient access to the nut G for the purpose of turning the same, the plate A is provided with an opening A for the in sertion "of a suitable tool to engage vertical grooves Gr formed in the peripheral face of the nut G? to turn the latter.

The cam F is preferably provided with spiral ribs engaging spiral grooves in the cam E so that when the cam E is turned in the direction of the arrow at then the cam F is caused to slide upward on the polygo nal portion G of the bolt G and against the tension of the heavy spring H, and when the cam E is released the tension of the spring H forces the cam F downward and in doing so the cam F turns the cam E back to normal position.

The bottom of the sliding cam G is normally seated on a washer I held against movement on the polygonal portion Gfof the bolt G, the washer resting on the biacket A and a ball oi othei bearlng J being interposed between the rotatable cam E and rings.

the washer I, as plainly indicated in Fig. 3. A spring K is coiled around the washer I and has one end secured to the bracket A while the other end is attached to the lever D so as to normally hold the latter in a forward position as indicated in the draw- The free or projecting end of the lever D is preferably in the shape of a fork, between the members of which is mounted a pawl L on a vertical pivot L at tached to the fork. The forward end of the pawl L projects slightly beyond the forward end of the lever D while the rear end of the pawl L is provided with ratchet teeth L adapted to engage ratchet teeth E formed on the peripheral face of the outer turnable cam A spring L is attached to the forward end ofthepawl L and rests with its free end on the lever D so as to normally hold the pawl L in such a position that its ratchet teeth L are out of engagement with the ratchet teeth E. The end of the pawl L is provided with an extension L engaging a projection D formed on the lever D to limit the outward swinging movement of the rear end of the pawl L.

- As previously mentioned, the spring K holds the lever D and its pawl L in a forward position, as shown in Figs. 1, 2, 3 and 4, and the spring L holds the pawl L out of engagement with the turnable cam E, and consequently the lever D is free to swing on the cam E as a fulcrum and only against the tension of the light spring K. Now when the door is closed with ordinary force or speed the free end of the door finally 4 strikes the forward end of the pawl L, but

as the impact is very slight the pawl is not caused to turn but a swinging motion is given to the lever D against the tension or I the spring K so that the door closes'easily.

When the door, however, is slammed or closed with more than ordinary force or speed then the impact of the door on the pawl L is such as to swing the same on its pivot L whereby the teeth L are moved in engagement with the ratchet teeth E so that the impact is transmitted to the lever D and to the cam E to rotate the latter, whereby the cam F is forced to slide upward on the polygonal portion G of the bolt G against the tension of the spring H. Thus by the arran ement described the cushion ing device is rought into action to cushion the door in case the latter is slammed with more than ordinary force, but when the door is closed with ordinary force or speed the cushioning device is not actuated and remains dormant as the lever D then swings freely on'the cam E and against the tension of the light spring K;

When the force of the slammed door has been spent inturning the lever D in the direction of the arrow a and with it the cam E to raise the cam F against the tension of the spring H then the latter returns the parts to normal position, and then the spring L throws the pawl L out of engagement with the ratchet teeth E to allow the lever D to swing freely in the direction of the arrow a so that the door can move shut against the tension of the light spring K. It is understood that the free end of the lever D and the pawl L can readily pass through the opening A into the recess B in the door casing B. l/Vhen the door strikes the forward end ofthe pawl L and imparts a swinging motion to the same then the face of the forward end of the pawl L comes approximately flush with the forward end of the lever D so that the door bears against both the pawl L and the lever D to swing the latter in the direction of the arrow a (see Fig. 4).

In the modified form shown in Figs. 5, 6, 7 and 8, the supporting plate N is attached by screws N to the casing O, and the plate is provided with an inwardly-extending bracket N passing into a recess 0 formed in the door casing 0. On the bracket N is held a vertically-disposed bolt P fastened in place by a set screw P screwing in the plate N and the bracket N and the said bolt P is provided with a lengthwise-ex tending groove P into which extends the inner endQg of a helical spring Q fastened at its outer end to a disk R, on which is mounted to swing loosely a lever S carrying a pawl T provided with ratchet teeth T adapted to engage ratchet teeth R on the peripheral surface of the disk R. The pawl T' is provided with slots T, T through which pass pins S S forming part of the lever S and against the pin S presses a spring T held in the pawl T and abutting against a set screw T screwing in the forward or base end of the pawl T. The spring T? serves to normally hold the pawl T in an outermost position with its teeth T out of engagement with the teeth R on the disk B. The disk R is provided at the bottom and top with beveled annular surfaces R R of which the lower or bottom surface R engages a correspondingly shaped beveled surface N on the bracket N and the beveled surface R is in engagement with a correspondingly shaped surface U formed on a disk U having a tongue U extending into the groove P so as to hold the disk D against turning on the bolt P, to allow the disk U to slide up and down on the bolt 1 A spring V bears with its lower end on the disk U and abuts with its upper end against the under surface of nut P screwing on the upper threaded end of the bolt P. The nut P as well as the head Pi of the bolt P are provided with vertical slots for engagement newest by tools inserted through openings N, N formed in the plate l to permit of turning the nut P while holding the bolt P stationary to adjust the tension of the spring V. A. light spring V7 is fastened at one end to the peripheral face of the disk R while the other end of the spring W is attached to a pin S forming part of the lever S, which latter is preferably made of two parts connected with each other by the pins S S and S The spring W serves to normally hold the lever S in a forward position so that the free end of the lever S as well as the forward end of the pawl 1 project into the path of the door X to be checked and cushioned. A stop pin R is attached to the disk R and abuts against the forward wall of an opening N formed in the plate N and through which opening extends the lever S and its pawl T.

When the door is closed with ordinary force or speed and it strikes the pawl T then the latters position is not changed relative to the lever S, and consequently a rearward swinging motion is given to the lever S on which the pawl T is held as above described, the lever S swinging in the direction of the arrow 6' against the tension of the light spring W. When the door, however, is slammed and strikes the pawl 'l with considerable force then the spring T is compressed and the pawl is caused to move on the lever S to engage the ratchet teeth T with the ratchet teeth R of the disk R, whereby the latter is turned with the lever S in the direction of the arrow I). On turnthe disk it the helical spring Q, is placed under tension so as to cushion or check the door and when the force of the slamming of the door is spent the spring Q returns the disk R, the lever S and pawl T by turn ing the said parts in the inverse direction of the arrow 6, and as the force of the door against the pawl T is also spent the spring T returns the pawl T to normal position, that is, moves the ratchet teeth T out of engagement with the ratchet teeth B so that the lever S is unlocked and is free to swing independent of the cushioning device and against the tension of its light spring W. The door X can now be pulled shut, it being understood that in doing so the lever S is swung inwardly in the direction of the arrow 7) completely free of the cushioning device, which remains dormant for the time being.

In order to prevent an easy turning of the disk R in addition to the force exerted by the spring Q, use is made of the friction disk U and the spring V to hold the disk R against easy turning, it being under stood that both surfaces R R are in contact with the fixed surfaces N U of the bracket N and the disk U, respectively,

. force.

2. A door buffer, comprising a cushioning device, an oscillating member, and means for actuating the said cushioning device from the said member on slamming the door, the said oscillating member oscillating free of the said cushioning device on closing the door with ordinary force.

A door buffer, comprising a cushioning device, concealed in the door casing, and an oscillating actuating member extending into the path of the door to move with the latter on closing the door with ordinary force and without affecting the said cushioning device, the said actuating member engaging the cushioning device on being struck with force by the said door on the latter being slammed.

i. A door bufier, comprising a cushion ing device under heavy spring pressure, a lever under light spring pressure and adapted to be oscillated on the door closing, and a spring pawl and ratchet connection between the said lever and the said cushioning.

device and inactive on closing the door with ordinary force to allow the lever to swing freely with the door, the said connection becoming active on closing the door with more than ordinary force to connect the lever with the said cushioning device.

5. A door buffer, comprising a cushioning member under heavy spring pressure and having ratchet teeth, a lever mounted to normally swing freely relative to the said cushioning member, and a springpressed, pawl mounted on the said lever and adapted to engage the said ratchet teeth, the pawl being normally out of engagement with the said ratchet teeth and in the path of the by the action of the said outer cam, a heavy spring bearing on the said inner cam, ratchet teeth on the outer cam, a lever mounted to oscillate on the said outer cam, and a spring-pressed pawl on the lever and adapted to engage the said ratchet teeth to actuate the outer cam.

7. A door bufi er, comprising an outer cam and an inner cam mounted to-slide axially by the action of the outer cam, a heavy spring bearing on the said inner cam, ratchet teeth on the outer cam, a lever mounted to oscillate on the said outer cam, a springpressed pawl on the lever and adapted to engage the said ratchet teeth, and a light spring pressing the said lever.

8. A door buffer, comprising an outer cam and an inner cam mounted to slide axially by the action of the said outer cam, a heavy spring bearing on the said inner cam, ratchet teeth on the outer cam, a lever mounted to oscillate on the said outer cam, a spring-pressed pawl on the lever and adapted to engage the said ratchet teeth to actuate said outer cam, and means for adjusting the tension of the said heavy spring.

9. A door buiier, comprising a support for attachment to the door casing, a bolt held on the said support and provided With a polygonal portion on the shank, a sliding cam mounted to slide on the said polygonal bolt portion, an actuating cam mounted to turn on the sliding cam for imparting sliding motion to the same, the said actuating cam having exterior ratchet teeth, a lever fulcrumed loosely on the said actuating cam, a spring-pressedpawl on the said lever and adapted to'engage the said ratchet teeth to actuate said actuating cam, a heavy spring coiled on the said bolt and bearing on the said sliding cam and against the nut of the bolt, and a light spring pressing the said lever.

10. A door butter, comprising a support for attachment to the door casing, a bolt held on the said support and provided with a polygonal portion on the shank, a sliding cam mounted to slide on the said polygonal bolt portion, an actuating cam mounted to turn on the sliding cam for imparting sliding motion to the same, the said actuating cam having exterior ratchet teeth, a lever fulcrumed loosely on the said actuating cam, a spring pressed pawl on the said lever and adapted to engage the said ratchet teeth, a heavy spring coiled on the said bolt and bearing on the said sliding cam and against the nut of the bolt, a nut on the bolt for adjusting the tension of the said spring, a light spring pressing the said lever, and a bearing for the bottom of the said actuating cam to turn on. v

1. A door bufier, comprising a light resistance device actuated upon the application of ordinary force, and a heavy resistance device controlled by the light resistance device and actuated thereby upon the application of more than ordinary force.

12. A door bufier, comprising a light resistance device actuated on closing the door, a heavy resistance device, and a connection member moving bodily with the said light resistance device and normally out of engagement with the said heavy resistance device, the said connecting member moving into engagement with the said heavy resistance device on forcibly actuating the light resistance device when slamming the door.

13. A door bufi'er, comprising resistance devices, one being provided With a light spring and the other with a heavy spring,

and a connecting member carried by the said light spring resistance device and out of engagement with the said heavy spring resistance device on gently closing the door, the said connecting member moving into engagement with the said heavy spring resistance device on forcibly actuating the said light spring resistance device when slamming the door. v

14C. in a door bufier the combination of a light resistance device, and a heavy resistance device with which the light resistance device is engageable when the latter is sub-- jected to more than ordinary force.

15. A door 'bufi'er comprising a cushioning member, an actuating membertherefor and passively coupled thereto, and means con-' trolled by the actuating member to render the cushioning member inactive on the door closing with ordinary force, and actively coupling the actuating and cushioning members upon the door members upon the door closing with more than ordinary force.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

DOCTOR FRANKLIN OLIVER.

. Witnesses:

Trmo. Gr. Hosanna, JOHN P. DAVIS.

Goggles of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

